Sound and Hearing•HearingoLike olfaction, hearing is a distance senseoLike touch, the physical stimulus for hearing in mechanical pressureoIn contrast to vision, we can detect objects in all direction around the body, we can detect objects around or through visually occluding barriersoHearing works equally well both day and night whereas to see who need a light source•Physical nature of soundoAll sounds originate as vibration, which requires massand elasticityoThe energy that initiates the vibration of an object can be exogenous (plucking a guitar string) or endogenous (speech)oVibration can be periodic (regularly repeating pattern) or random (no repeating pattern, random movement- such as impact sounds)•Periodic condensation and rarefraction of air molecules produced by a tuning forkoHit the tuning fork, impart of energy to it, gets displaced and bounces back (elasticity) air molecules are pushed together, increasing their density, leaving

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